import Vue from 'vue'
import Router from 'vue-router'
import Login from '../components/Login.vue'
import Home from '../components/Home.vue'
import welcome from '../components/welcome.vue'
import Users from '../components/user/Users.vue'
import Rights from '../components/power/Rights.vue'
import Roles from '../components/power/Roles.vue'
import Good_list from '../components/goods/goods_list.vue'
import Params from '../components/goods/params.vue'
import Categories from '../components/goods/categories.vue'
import Orders from '../components/orders/orders.vue'
import Reports from '../components/reports/reports.vue'
import Add from '../components/goods/add.vue'

Vue.use(Router)

// path是被监听的对象
// component 手写的时候这个单词千万不要写错了
const router = new Router({
  routes: [
      { path:'/',redirect:'/login'},
      { path:'/login',component:Login},
      {
        path:'/home',
        component:Home,
        redirect:'/welcome',
        children:[{path: '/welcome',component:welcome},
                  { path: '/users', component: Users },
                  { path:'/rights',component:Rights},
                  { path:'/roles',component:Roles},
                  { path:'/goods',component:Good_list},
                  {path:'/params',component:Params},
                  {path:'/categories', component:Categories},
                  {path:'/orders',component:Orders},
                  {path:'/reports',component:Reports},
                  {path:'/goods/add',component:Add}
        ]
      }
  ]
})


// 挂载路由导航守卫，有些页面是需要登录之后才能登录的，如果没有登录的情况下访问就跳转到登录页
router.beforeEach((to, from, next) => {
  // to 将要访问的路径
  // from 代表从哪个路径跳转而来
  // next 是一个函数，表示放行
  //     next()  放行    next('/login')  强制跳转

  if (to.path === '/login') return next()
  // 获取token
  const tokenStr = window.sessionStorage.getItem('token')
  if (!tokenStr) return next('/login')
  next()
})

export default router
